Improved griwding-milii



v.9. Sheets-Sheet 2.

E. HARRISON.

l Grinding Mill.

Patented Dec. 29;*1868.

MPETERS, PHOYQMTHDGRAPNER WASH NGwN u c ginnt, @anni Msaaeeww @time Meob EDWARD HA RRISON, OF NEW HAVEN, CONNECTICUT.'

Leners Patent No. 85,444, dated December 29, 1868.

IMPRO'VED GBINDING-MLL.

To all .whom it ma/y concern Be it known that I, EDWARD HARRISON, of NewHaven, in the county of New Haven, and State of Connecticut, haveinvented anew Improvement in Grinding-Mills and I do hereby declare thefollowing, when taken in connection with the accompanying drawings, andthe letters of reference marked thereon, to be a full, clear, and exactdescription of the same, and which said dlawings'constitute part of thisspecification, and represent, in I Figure l, a side view;

Figure 2, a front view;

Figure 3, a longitudinal'central section;

Figure 4, a vertical section between the two stones; and in Figures 5,6, and 7, modifications of my invention.

rlhis invention relates to an'improvement in mills for grinding grain,specially designed for the manufacture of flour, the object being tocombine with the millcasing the bolt, so that the our and the hulls maybe discharged separately from the same mill; and

The invention consists in the arrangement of a boltcloth, or screen,around the stones, so that the meal, in passing from the stones, isthrown against the boltcloth, the ne or flour-portion passing throughthe cloth to one exit, while the coarse or hull-portion is driven out atanother exit, separating the one entirely from the other.

To enable others to construct and'use my improvement, I will fullydescribe the same, as illustrated in the accompanying drawings.

A is the casing lof the mill, constructedin any convenient form,centrally through which passes a shaft, B, supported in a bearing,- O,and in an adjustable step, D, and caused to revolve by the applicationof power thereto through the pulley E,

On the said4 shaft is fixeda plate, F, with a hub, G, so as to receiveand carry the runner-stone-H, and in a positionlcorresponding to therunner-stoneH, .the bede stone I is arrangedwithin the case, as seen iniig. 3.

Within the case, between the stones and case, and

' surrounding the stones, I place a cylinder, K, of boltcloth, as seenin figs. 3 and 4, supported in the case so that the runner-stone willrevolve freely within the -Xed bolt-cloth, as seen in iig. 3, theboltfcloth secured to a fixed plate, L, upon one side, and by a ring, a,upon the other edge, and these secured by bolts, d.

To the edge of the runner-stone casing, or plate F, are'xed sweeps, c,more or less in number, (by preference, two,) which, as the runner-stonerevolves, sweep around between the bed-stone and bolt-cloth; and to theshaft, I ix other sweeps, b, as seen in gs. 3 and 4, so as to revolve inthe space between the bolt-cloth and the inner surface of the casing, inclose proximity to the bolt-cloth.

M is the outlet from the casing outside the bolt-cloth. (See g. 4.)

N is the outlet between the bolt-cloth and the stone, as seen in fig. 2.i V

, P is the hopper, into which the grain is placed, opening through thebedfstone I, as seen in g. 3.

At the said opening is arranged a worm, R, fixed to.

tween the stones, as fast as ground, and, by the centrifugal force ofthe revolving stone, the meal is thrown against the bolt-cloth, and thesweeps c serve to keep the m'eal in agitation between the boltcloth andthe stones, and this, by the rapid revolution of the stones, forces thefiner portion or flour through the bolt-cloth, which is brushed or sweptfrom the bolt-cloth by other sweeps, b, and by the said sweeps -b theflour is forced out through the opening M, while the coarser portion,which cannot pass through the bolt-cloth, is forced, by the sweep c, outthrough the opening N between the bolt-clothand the stones.

The sweeps are inclined, upon their advancing edge, towards the outletN, which facilitates the passage of the coarser portion, to that side ofthe mill, and, .consequently, out from themilh The casing of the mill,the driving and adjustment of the stones, are such as are in use, andhave been long manufactured and known to the trade as the Hare risonmill.

The position of the outlets M and N may be varied,

as it is not essential at which point around the'mill they are placed. i

Itis often desirable, in grinding wheat, to produce two qualities orgrades of flour, which is accomplished by the use of two bolt-cloths, ofdifferent meshes.

In iig. 5, I illustrate my arrangement for producing two grades offlour. Y

The different parts of the mill are represented by the same letters,but, in addition to the bolt-cloth K, I place between that and the case,a second boltcloth,S, also' making an additional outlet, T, between thetwo boltclothsthe outer cloth S being of' aner mesh than the inner; andI also arrange an additional sweep, jf'between the two cloths. l v g Bythis arrangement, that portion of our which will pass the rstbolt-cloth, enters the space between the two bolt-cloths, and is thereseparated, the finer portion passing through the cloth S, while thecoarser portion passes through the outlet T. f

Other bolt-cloths, forfurther grading of the flour, may be added in likemanner.

In g. 6, I showa diiferent modication for producing different grades offlour.

I employ, as inthe first instance, asingle bolt-cloth,

but of two different meshes, 'm and n, n being the finer,l

and I form a ring or partition, l, around the space between thebolt-cloth and casing, so that the portion of flour which passes throughone boltcloth, cannot enter into the chamber where the i'our from theother chamber passes, and I form a separate outlet, M and T, for theseparate spaces therefore, only the finest portion of the our will passthrough the part n, while the coarser will pass out through the part anof the bolt-cloth, and each quality through its respective outlet, thebran pass- .ing out separated, as before.

I have ,thus far represented the holtlcloths as arranged entirely aroundthe stones, and have also represented the sweeps as being fixed withinthe case to the shaft. It will, however, be readily seen that theholt-cloth need not extend entirely around, as a portion of thecylindermay be of solid material, the flour only passing out of theperforated or cloth-portion of the cylinder; and it will also be readilyseen that the sweeps may be detached from and driven independent of theshaft, by arranging a plate, rin g, or wheel, Within the case, withprojecting arms, to act as sweeps, and communicating power to the saidplate from outside the cylinder. 4

In fig. 7, I show a still different modification or arrangement of thebolt-cloth. In this, the bolt-cloth K is simply placed over the outletfrom the casing. This arrangement serves a good purpose when it is notdeslrable to entirely separate the flour from the hulls,

In this construction, the grain, when ground, is thrown against theclothv K, the nest portion of which will pass through, and escape at theoutlet M, while the coarscr portion will escape atanother outlet, withthe hulls or gran, thus,'in the 4same mill, producing both meal 'andour.

I have thussucceeded in producing a mill of very .little enlargeddimensions, which combines within itself both a grinding andholting-apnaratus--an advantage oi'er other mills and bolting-apparatus,which is too apparent to require that more be said in explanation.

I do not claim the arrangement of a bolt-cloth upon the stones of agrinding-mill, as such, I am, aware, is not new.

Having thus fully described my invention,

What I claim as new and useful, and desire to secure by Letters Patent,is-T A The arrangement, with the casing which encloses the stones, ofone or more bolt-cloths, so as to separate the liner from the coarserportion of meal within the casing of the mill, substantially as setforth.

EDWARD HARRISON.

Witnesses: Y

J. H. SHUMWAY, A. J. TIBBI'rs.

